Nickel alloy



Patented July 22, 1924.

;.;umm sures Nomi vro'ron HYZBINET'I'E, or NEW YORK, 11. Y.,. assrenoa'ro NATIONAL :lums'r PATENT OFFICE.

COMPANY LIMITED, OF TORONTO, CANADA.

NICKEL ALLOY.

No Drawing.

To all whom it may concern:

Be it known that I, NOAK VICTOR HYBINETTE, a citizen of Norway, residingtemporarily at New York, in the county of New York, State of New York,have invented certain new and useful Improvements in Nickel Alloys; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in nickel alloys and moreparticularly nickel alloys containing carbon.

In making nickel alloys containing carbon, which are sometimes referredto as carbonized nickel, it has heretofore been considered important andeven necessary to have present in the alloy a small amount of silicon,for example, a of 1% or more. This silicon may be incorporated with thenickel in various ways. It maythus be introduced, to a greater or lessextent, from graphite crucibles owing to the silica which the graphitecontains. duced from the furnace lining in which the nickel is smelted,where the furnace lining is of siliceous character. In fact, it ispractically impossible by common methods of nickel smelting (other thanelectrolytic) to produce nickel and particularly carbonized nickel whichdoesnot contain silicon in considerable amount, that is, a substantialfraction of a percent or even more.

I have found, contrary tothe commonly accepted belief, that silicon isnot only unnecessary but is even harmful in carbonized nickel for manypurposes, and that an improved alloy can be produced by combining carbonwith nickel which contains practi-- I cally no silicon, i. e., less thanabout 0.1%

silicon. I may produce the new carbonized nickel from. nickel such aselectrolytic nickel, which is originally free from silicon, by carryingout the carbonizing treatment under conditions such that no silicon isintroduced with the carbon; or I can use nickel whichcontains siliconby' first removing the silicon before the carbon is added, and by thenincorporating the carbon under such. conditions that the introduction ofslhconis avoided.

It may also be intro-' Application filed August 1, 1921. Serial No.489,096.

In producing the new carbonized material I may, for example, meltelectrolytic nickel and treat it with carbon which is free or Isubstantially free from silicon, such as charcoal, carrying out theprocess in an apparatus having a lining which is likewise free fromsilicon, for example, in an apparatus lined with magnesite. The amountof carbon incorporated with the nickel and may be as high as 1 or 2% ormore, or or even less than 1%, for example, i or' of 1%.

Where the nickel contains silicon I may free it from silicon bysubjecting it to a blowing operation with air until the silicon isoxidized, and removing the silica in the form of a slag, and then addingthe carbon the nickel. This chromium is also objectionable for manypurposes but it can be readily I removed in the same manner and at thesame time as the silicon by subjectingthe nickel to a blowing operationand slagging off the oxidized chromium and silica. The resulting nickel,free from chromium and silicon, can then be carbonized in the mannerabove described.

The new carbonized nickel of the present invention is particularlyadvantageous for many purposes. It can be cast in metal molds withoutproducing cast articles of objectionable hardness; whereas carbonizednickel which contains silicon cannot be cast in' metal molds withoutimparting a degree of hardness to the articl which is objectionableforcertain purposes. The new alloy accordingly can be used for purposeswhere carbonized nickel containing silicon, or containing silicon andchromium are objectionable.

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